In 1961, Peter Benenson, a British lawyer, read a newspaper story about two Portuguese students who went to jail for making a toast to freedom. He wrote letters to the Portuguese government and got others to do so as well, and it got media attention, and they were freed.

That was the start of Amnesty International, which to this day, simply asks people to write a letter when they see an injustice. The spray painting potholes story has the same theme: "Better to light a single candle than to curse the darkness."